Anatomia e densidade básica da madeira de Caesalpinia pyramidalis Tul. (Fabaceae), espécie endêmica da caatinga do Nordeste do Brasil

Abstract

RESUMO -(Anatomia e densidade básica da madeira de Caesalpinia pyramidalis Tul. (Fabaceae), espécie endêmica da caatinga do Nordeste do Brasil). Este trabalho objetivou estudar a anatomia e a densidade básica da madeira de Caesalpinia pyramidalis utilizada pelas comunidades locais, ocorrente na caatinga de Pernambuco, nos municípios de Serra Talhada e Sertânia, assim como comparar a percentagem dos elementos do lenho no tronco e nos galhos, na própria árvore, a fim de estabelecer o potencial total do lenho para produção de energia. As amostras do lenho do tronco (DAP) e de ramos de seis árvores da espécie foram coletadas nos dois municípios acima citados, em 2002. As análises das amostras seguiram os métodos usualmente empregados em estudo de anatomia de madeiras. Pelos parâmetros anatômicos do lenho e a elevada densidade básica (>0,84 g/cm 3 ), concluiu-se que Caesalpinia pyramidalis revela grande quantidade de celulose e lignina, portanto apresentou perspectivas seguras para produção de álcool combustível e carvão vegetal. Pode-se propor o uso do lenho do tronco e dos galhos como combustível, desde a fase jovem da madeira, pela grande concentração de fibras, menor concentração de vasos e menor quantidade de parênquima, nos espécimes dos dois municípios. Palavras-chaves:anatomia e densidade da madeira, caatinga, Caesalpinia, carvão ABSTRACT -(Wood anatomy and basic density of Caesalpinia pyramidalis Tul. (Fabaceae), an endemic species of Northeast Brazil). This work aimed to study the anatomy and basic density of Caesalpinia pyramidalis wood, used by local populations in the municipalities of Serra Talhada and Sertânia (Pernambuco), to assess the percentage of wood elements in the trunk and branches in both localities, and in the tree itself, in order to establish total wood potential for energy production. Samples of the trunk (dbh) and of branches from six trees of the species were collected in 2002. Sample analysis followed the usual methods of wood anatomy studies. Based on the anatomical parameters of the trunk and the high basic density (>0.84 g/cm 3 ), we conclude that Caesalpinia pyramidalis wood contains an enormous amount of cellulose and lignin. Due to these features, this species showed good perspectives for the production of alcohol and charcoal. The trunk and branches can be used for fuel even at the immature stage because of high fiber concentration, low vessel concentration and low amount of parenchyma at this stage in both municipalities.

Physiological maturity of fruits and seeds of Poincianella pyramidalis (Tul.) L.P. Queiroz

“…gradually increased, reaching maximum values in 58 days after flowering. At this point, results on percentage and speed of germination as well as on dry mass of fruits and seeds were lower than those obtained at 65 and 72 days after flowering, respectively (Silva et al, 2008). According to the same authors, the size of fruits is not an efficient variable for physiological maturity determination.…”

“…For the seeds of this species, a white coloration of the tegument was observed in the three first harvests, passing then to the brown color in the three subsequent harvests and returning to present a whitish coloration at 72 days after flowering (Silva et al 2008).…”

“…L.P. Queiroz is an arboreal species endemic to the Caatinga (Monteiro et al 2005), popularly known by its common name "catingueira" (Braga, 1960), which is found in several plant associations occurring in the states of Piauí, Ceará, Rio Grande do Norte, Paraiba, Pernambuco, Alagoas, Sergipe, Bahia, and Northern Minas Gerais being widely used by local communities for production of firewood and charcoal (Silva et al 2009). …”

Contracciones Y Propiedades Físicas De Acacia Mangium, Tectona Grandis Y Terminalia Amazonia, Maderas De Plantación en Costa Rica

“…On the other hand, specific gravity is considered one of the best indicators of mechanical wood strength (Da Silva, Ribeiro, Gasson, & Cutler, 2009). Specific gravity refers to the portion of cell wall, in the wood fiber, that is void space with regard to the cell lumen (Wiendenhoeft, 2010).…”

“…Por otra parte, el peso específico es considerado como uno de los mejores indicadores de la resistencia mecánica de la madera (Da Silva, Ribeiro, Gasson, & Cutler, 2009). El peso específico se refiere a la proporción de pared celular, en la fibra de madera, que es espacio vacío respecto del lumen celular (Wiendenhoeft, 2010).…”